mirror of
https://github.com/espressif/ESP8266_RTOS_SDK.git
synced 2025-08-06 15:15:15 +08:00
c905a09a24
1. Add API to stop PWM.
2. Add API to set the phase of each PWM channel.
3. Add pwm example.
145 lines
4.7 KiB
C
145 lines
4.7 KiB
C
/*
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* ESPRESSIF MIT License
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*
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* Copyright (c) 2015 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
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*
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* Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
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* it is free of charge, to any person obtaining a copy of this software and associated
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* documentation files (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "esp_common.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "pwm.h"
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#define PWM_0_OUT_IO_MUX PERIPHS_IO_MUX_MTDI_U
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#define PWM_0_OUT_IO_NUM 12
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#define PWM_0_OUT_IO_FUNC FUNC_GPIO12
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#define PWM_1_OUT_IO_MUX PERIPHS_IO_MUX_MTCK_U
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#define PWM_1_OUT_IO_NUM 13
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#define PWM_1_OUT_IO_FUNC FUNC_GPIO13
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#define PWM_2_OUT_IO_MUX PERIPHS_IO_MUX_MTMS_U
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#define PWM_2_OUT_IO_NUM 14
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#define PWM_2_OUT_IO_FUNC FUNC_GPIO14
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#define PWM_3_OUT_IO_MUX PERIPHS_IO_MUX_MTDO_U
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#define PWM_3_OUT_IO_NUM 15
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#define PWM_3_OUT_IO_FUNC FUNC_GPIO15
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//PWM period 500us(2Khz)
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#define PWM_PERIOD (500)
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/******************************************************************************
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* FunctionName : user_rf_cal_sector_set
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* Description : SDK just reversed 4 sectors, used for rf init data and paramters.
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* We add this function to force users to set rf cal sector, since
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* we don't know which sector is free in user's application.
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* sector map for last several sectors : ABCCC
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* A : rf cal
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* B : rf init data
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* C : sdk parameters
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* Parameters : none
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* Returns : rf cal sector
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*******************************************************************************/
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uint32 user_rf_cal_sector_set(void)
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{
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flash_size_map size_map = system_get_flash_size_map();
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uint32 rf_cal_sec = 0;
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switch (size_map) {
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case FLASH_SIZE_4M_MAP_256_256:
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rf_cal_sec = 128 - 5;
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break;
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case FLASH_SIZE_8M_MAP_512_512:
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rf_cal_sec = 256 - 5;
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break;
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case FLASH_SIZE_16M_MAP_512_512:
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case FLASH_SIZE_16M_MAP_1024_1024:
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rf_cal_sec = 512 - 5;
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break;
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case FLASH_SIZE_32M_MAP_512_512:
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case FLASH_SIZE_32M_MAP_1024_1024:
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rf_cal_sec = 1024 - 5;
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break;
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case FLASH_SIZE_64M_MAP_1024_1024:
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rf_cal_sec = 2048 - 5;
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break;
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case FLASH_SIZE_128M_MAP_1024_1024:
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rf_cal_sec = 4096 - 5;
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break;
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default:
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rf_cal_sec = 0;
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break;
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}
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return rf_cal_sec;
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}
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/******************************************************************************
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* FunctionName : user_init
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* Description : entry of user application, init user function here
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* Parameters : none
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* Returns : none
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*******************************************************************************/
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//pwm out_put io
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uint32 io_info[][3] = {
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{ PWM_0_OUT_IO_MUX, PWM_0_OUT_IO_FUNC, PWM_0_OUT_IO_NUM },
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{ PWM_1_OUT_IO_MUX, PWM_1_OUT_IO_FUNC, PWM_1_OUT_IO_NUM },
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{ PWM_2_OUT_IO_MUX, PWM_2_OUT_IO_FUNC, PWM_2_OUT_IO_NUM },
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{ PWM_3_OUT_IO_MUX, PWM_3_OUT_IO_FUNC, PWM_3_OUT_IO_NUM },
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};
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//dutys table
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uint32 dutys[][4] = {
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{250, 250, 250, 250},
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};
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//phase table
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int phase[][4] = {
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{0, 0, 50, -50},
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};
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void user_init(void)
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{
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printf("SDK version:%s\n", system_get_sdk_version());
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pwm_init(PWM_PERIOD, dutys[0], 4, io_info);
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pwm_set_channel_reverse(0x1<<0);
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pwm_set_phases(phase[0]);
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pwm_start();
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int count = 0;
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while(1) {
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if(count == 20) {
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//channel0, 1 output hight level.
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//channel2, 3 output low level.
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pwm_stop(0x3);
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printf("PWM stop\n");
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} else if(count == 30){
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pwm_start();
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printf("PWM re-start\n");
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count = 0;
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}
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count++;
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vTaskDelay(1000 / portTICK_RATE_MS);
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}
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}
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